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이희정 한국수학사학회 2003 Journal for history of mathematics Vol.16 No.3
The RSA cryptosystem is most commonly used for providing privacy and ensuring authenticity of digital data. 1'his system is based on the difficulty of integer factoring. Many attacks had been done, but none of them devastating. They mostly illustrate the dangers of improper use of RSA. Improper use implies many aspects, but here we imply the misuse of the parameters of RSA. Specially, sizes of parameters give strong effects on the efficiency and the security of the system. Parameters are also related each other. We analyze the relation of them. Recently many researchers are interested in side-channel attacks. We also investigate partial key exposure attacks, which was motivated by side-channel attacks. If a fraction of tile secret key bits is revealed, the private key will be reconstructed. We also study mathematical background of these attacks, solving modular multivariate polynomial equations.
이희정,허규찬,정인범,김선문,이태희,임의혁,최용우,김범경,강영우 대한소화기내시경학회 2004 Clinical Endoscopy Vol.29 No.6
Gastric carcinoid tumor is a rare neoplasm that occupies less than 1% of total gastric tumor. Especially, gastric carcinoid tumor with hemorrhage has been very rare. A sixty-three-year old male patient was admitted to the hospital because of hematemesis and melena. On the endoscopic examination, a 2 cm-long polypoid mass with central ulcer and hemorrhagic erosions was seen on the anterior wall of the mid-body without active bleeding. Endoscopic ultrasonography revealed that the lesion was limited to submucosa without evidence of metastasis to adjacent lymph node. We experienced a case of gastric carcinoid tumor accompanied with upper gastrointestinal bleeding. The patient underwent extended wedge resection and omentectomy under the diagnosis of type 3 carcinoid tumor. This tentative diagnosis was based on clinical and pathological findings. We report a case of gastric carcinoid with bleeding that is probably type 3. 위유암종은 빈도는 전체 원발성 위종양의 1%로 드물고 전형적인 유암종의 증상을 잘 나타나지 않는 것이 특징이다. 임상적, 조직학적으로는 크게 3가지 형태로 구분된다. 만성 위축성 위염 A형과 연관된 제1형, 다발성 내분비 종양에 병발된 제2형과 산발적으로 발생하는 제3형으로 구분된다. 토혈이나 흑색변 등의 출혈을 동반한 위유암종은 매우 드문 편이다. 63세 남자 환자가 토혈과 흑색변을 주소로 내원하였다. 환자에게 시행한 위내시경 검사에서 위체중부에 2 cm 크기의 중심부에 궤양을 동반한 융기성 병변이 관찰되었으나 급성출혈은 없었으며, 초음파 내시경 소견에서는 점막과 점막하층에 국한된 종괴로 관찰되었다. 내시경적 절제가 가능하였으며 임상적인 특징과 조직 검사에서 제3형의 위유암종으로 추정되어 쐐기절제술과 대망절제술을 시행하였다. 저자들은 출혈을 동반한 위유암종 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
이희정,유진영,강석진,김병기 대한병리학회 2003 Journal of Pathology and Translational Medicine Vol.37 No.1
We recently experienced an atypical chondroid lesion metastatic to the lung. Examined under the microscope, the excised nodules displayed abundant amounts of chondroid tissue and necrosis with dystrophic calcification. The calcification had a characteristic “chicken wire”pattern. The chondroblasts contained one or two round to oval, focally indented nuclei with inconspicuous nucleoli. Although some enlarged nuclei with mild to moderate pleomorphism were present, significant nuclear atypia was lacking. Mitotic figures were scarce (1/10 high power field). Scattered multinucleated osteoclast-type giant cells were observed among the chondroblasts. Thus, the possibility of chondroblastoma was considered first. Metastasis of histologically benign chondroblastoma is a rare event, but well documented. The pulmonary metastatic nodules were described as ceasing to grow in some cases; and a significant number of patients were free of tumors following removal of the metastatic nodules. These findings suggest that the metastasis may represent a simple transport phenomenon. However, there are, as yet, no histologic parameters that help determine whether these metastases are to cease their growth or will progress to kill the host.
이희정,유진영,강석진,김병기,강창석 대한병리학회 2003 Journal of Pathology and Translational Medicine Vol.37 No.4
Eccrine syringofibroadenoma is an uncommon benign eccrine tumor, which was first described by Mascaro in 1963. It usually develops on the extremeties of elderly persons. Recently we experienced a case of eccrine syringofibroadenoma that occured in a 38-year-old woman. She presented us an asymptomatic solitary reddish nodular plaque with a verrucous surface, which she’d had on her right arm for three months. Histologically, slender anastomosing epithelial cell cords with focal luminal differentiation resembling duct structures were embedded in a fibrovascular stroma. The net-like pattern of epithelial cells resembled that seen in fibroepithelioma.